Awesome build! Very clean and thought out.
I previously had a similar AA sump/refugium setup. I can’t tell in your picture, but I ended up having to drill a hole (also added flexible tubing for air) in the refugium drain back into the sump. Reason being every time I started up my return pump the refugium would overflow, being that there was no air it overflowed before creating a full siphon. Not sure if that will be the case for you, maybe I had too much flow or too small of a return pipe. Just wanted to share in case it was an oversight!
I previously had a similar AA sump/refugium setup. I can’t tell in your picture, but I ended up having to drill a hole (also added flexible tubing for air) in the refugium drain back into the sump. Reason being every time I started up my return pump the refugium would overflow, being that there was no air it overflowed before creating a full siphon. Not sure if that will be the case for you, maybe I had too much flow or too small of a return pipe. Just wanted to share in case it was an oversight!
